With GS and SGS certification
3x7 steps
Extension Size:493cm
Folding size:203x46x16cm
20GP/40GP/40HQ:230/460/507PCS
3X8 Steps
Extension size;580cm
Folding size:232x46x16cm
20GP/40Gp/40HQ:168/336/400pcs
3x9 Steps
Extension size:667cm
Folding Size:261x46x16cm
20GP/40GP/40HQ:140/280/360pcs
3x10 steps
Extension size:754cm
Folding size:290x46x16cm
20GP/40GP/40HQ:140/280/320pcs